A nurse from Devon has fended off competition from more than 50,000 medical colleagues across the world to win a 250,000 US dollar (£200,000) cash prize for her work in improving diabetes care.Margaret Shepherd, from Exeter, said she was left “shaking” after winning the Aster Guardians Global Nursing Award 2023 on International Nurses Day on Friday 12 May.The 60-year-old was chosen from more than 52,000 applicants across 202 countries, taking the award thanks to her efforts to improve diabetes diagnoses.